Musannaf Ibn Abi Shayba 18:496

Abu Bakr narrated to us, he said: Zayd ibn al-Hubab narrated to us, from Hammad ibn Salamah, from Iyas ibn Mu'awiyah, regarding a man who cut off the hand of a slave intentionally or gouged out his eye: He said, "He is for him, and upon him is his price."